Let me suggest one other thing. Take the four batteries to an Autozone and have them load tested. Many charging systems must see a certain voltage and battery resistance to begin charging. That is why I have automatic and non-automatic chargers in addition to a portable load tester. Also, when I need to bench test certain 12 volt systems (wiper motors, motors, fans, lights etc) the non-automatic charger works nicely since it is always putting out 12 volts. Probably a free or minimal charge for their service.
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